Crossidium davidai
Common name
Moss
Synonyms
None (first described in 1980)
Family
Pottiaceae
Flora category
Non-vascular – Native
Endemic taxon
No
Endemic genus
No
Endemic family
No
Current conservation status
- Conservation status of New Zealand mosses, 2014 (PDF, 583.87 kB)
The conservation status of 109 New Zealand moss taxa was assessed using the New Zealand Threat Classification System (NZTCS). Four taxa and one undescribed entity that were not included in previous assessments have been added to the list. The conservation status of only two taxa has changed in this assessment. A full list is presented, along with a statistical summary and brief notes on the changes. This list replaces all previous NZTCS lists for mosses. Authors: Jeremy R. Rolfe, Allan J. Fife, Jessica E. Beever, Patrick J. Brownsey and Rodney A. Hitchmough.
- Conservation status of New Zealand hornworts and liverworts, 2014 (PDF, 695.44 kB)
The conservation status of the New Zealand hornwort and liverwort flora is reassessed using the New Zealand Threat Classification System (NZTCS). A full list is presented, along with a statistical summary and brief notes on the most important changes. This list replaces all previous NZTCS lists for New Zealand hornworts and liverworts which previously had been part of a generic bryophyte conservation status assessment that included mosses. Authors: Peter J. de Lange, David Glenny, John Braggins, Matt Renner, Matt von Konrat, John Engel, Catherine Reeb and Jeremy Rolfe.
Source: NZTCS and licensed by DOC for reuse under the Creative Commons Attribution 4.0 International licence.
2009 | Non-resident Native – Vagrant | Qualifiers: DP, OL, SO
Previous conservation status
2004 | Threatened – Nationally Critical
Distribution
Indigenous. Widespread in Australia. In New Zealand known only from a single site on Banks Peninsula
Detailed description
Moss green when moist, deep olive-brown when dry. Leaves ligulate-obovate, to 1.50-1.90 x 0.50-0.65 mm wide, widest above middle, concave above, with the apex blunt, cucullate or with a small mucro; margin entire, narrowly recurved from apex to near the base; base not sheathing nor decurrent; upper laminal cells with fairly thin walls, hexagonal or polygonal 12-16 µm diameter, each with several crescentic papillae on both sides, the cells in two marginal row smooth and transversely rectangular; lower laminal cell much larger, smooth, rectangular, short and narrow near the margin; nerve ceasing at or just below apex; filaments 1-4 cells high, the cells 9-12 µm long, the terminal cell longer almost globose or ovoid, 20-25 µm diameter, with 4-6 mamillae. Seta 5-8 mm long, pale brown; capsule reddish-brown, slenderly ellipsoid, 2.0-2.3 mm long, nearly 0.5 mm wide, operculum conical, slightly bent, blunt; peristome c. 400 µm high, with a basal membrane c.80 µm tall , bearing 32 teeth, twisted to the right and covered with fine acute papillae; spores 18-22 µm diameter, minutely papillose.
Fruiting
Fruiting had occasionally been observed in New Zealand. However insufficient information exists from which to determine seasonal periodicity.
Threats
Highly threatened because it is known from one small population in a very vulnerable situation
Substrate
Terricolous on damp loess banks near streams
Fact Sheet Prepared for NZPCN by: P.J. de Lange 31 August 2007.